A daily updated filename extension database!

H1H file extension

The table below provides useful information about the .h1h file extension. It answers questions such as:

  • What is the .h1h file?
  • What program do I need to open a .h1h file?
  • How can the .h1h file be opened, edited or printed?
  • How can I convert .h1h files to another format?

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Microsoft Help Merged Hierarchy File

H1T file is a Microsoft Help Merged Hierarchy File. Microsoft Help is a system assistance program included with Microsoft Windows.
H1H format description not yet available
Category: Data files
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
H1H aliases:
H1H related links:
H1H related extensions:
Windows Help File

Windows Help Project

Microsoft Help Collection Definition

Microsoft Help Topic Definition

Microsoft Help Keywords Index

Microsoft Help VTopic Definition

Microsoft Help Compiled Help Data

Windows Help Project

Microsoft Help Validator File

Microsoft Help Merged Query Index

Other types of files may also use the .h1h file extension.

🚫 The .h1h file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

h1t, hh, hlh

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Microsoft Help Topic Definition
HTML Help Header File
PLINK Heterozygous Haploid Data
Ashampoo Photo Optimizer Data
C++ Header File

🔴 Can't open a .h1h file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .h1h file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .h1h file extension, write to us!

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